AMD64StringSubstitutions.java revision 12968:4d8a004e5c6d
1218065Sadrian/* 2218065Sadrian * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved. 3240592Sadrian * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4218065Sadrian * 5218065Sadrian * This code is free software; you can redistribute it and/or modify it 6218065Sadrian * under the terms of the GNU General Public License version 2 only, as 7218065Sadrian * published by the Free Software Foundation. 8218065Sadrian * 9218065Sadrian * This code is distributed in the hope that it will be useful, but WITHOUT 10218065Sadrian * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11218065Sadrian * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12218065Sadrian * version 2 for more details (a copy is included in the LICENSE file that 13218065Sadrian * accompanied this code). 14218065Sadrian * 15218065Sadrian * You should have received a copy of the GNU General Public License version 16218065Sadrian * 2 along with this work; if not, write to the Free Software Foundation, 17218065Sadrian * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18218065Sadrian * 19218065Sadrian * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20218065Sadrian * or visit www.oracle.com if you need additional information or have any 21218065Sadrian * questions. 22218065Sadrian */ 23218065Sadrianpackage org.graalvm.compiler.replacements.amd64; 24218065Sadrian 25218065Sadrianimport org.graalvm.compiler.api.replacements.ClassSubstitution; 26218065Sadrianimport org.graalvm.compiler.api.replacements.MethodSubstitution; 27218065Sadrianimport org.graalvm.compiler.graph.Node.ConstantNodeParameter; 28218065Sadrianimport org.graalvm.compiler.word.Pointer; 29218065Sadrianimport org.graalvm.compiler.word.Word; 30218065Sadrian 31218065Sadrianimport sun.misc.Unsafe; 32218065Sadrian 33218065Sadrian// JaCoCo Exclude 34218065Sadrian 35218065Sadrian/** 36218065Sadrian * Substitutions for {@link java.lang.String} methods. 37218065Sadrian */ 38218065Sadrian@ClassSubstitution(String.class) 39218065Sadrianpublic class AMD64StringSubstitutions { 40218065Sadrian 41218065Sadrian // Only exists in JDK <= 8 42218065Sadrian @MethodSubstitution(isStatic = true, optional = true) 43218065Sadrian public static int indexOf(char[] source, int sourceOffset, int sourceCount, 44218065Sadrian @ConstantNodeParameter char[] target, int targetOffset, int targetCount, 45218065Sadrian int origFromIndex) { 46218065Sadrian int fromIndex = origFromIndex; 47218065Sadrian if (fromIndex >= sourceCount) { 48218065Sadrian return (targetCount == 0 ? sourceCount : -1); 49218065Sadrian } 50218065Sadrian if (fromIndex < 0) { 51218065Sadrian fromIndex = 0; 52218065Sadrian } 53218065Sadrian if (targetCount == 0) { 54218065Sadrian // The empty string is in every string. 55218065Sadrian return fromIndex; 56218065Sadrian } 57218065Sadrian 58218065Sadrian int totalOffset = sourceOffset + fromIndex; 59218065Sadrian if (sourceCount - fromIndex < targetCount) { 60218065Sadrian // The empty string contains nothing except the empty string. 61218065Sadrian return -1; 62218065Sadrian } 63218065Sadrian assert sourceCount - fromIndex > 0 && targetCount > 0; 64218065Sadrian 65218065Sadrian Pointer sourcePointer = Word.objectToTrackedPointer(source).add(Unsafe.ARRAY_CHAR_BASE_OFFSET).add(totalOffset * Unsafe.ARRAY_CHAR_INDEX_SCALE); 66218065Sadrian Pointer targetPointer = Word.objectToTrackedPointer(target).add(Unsafe.ARRAY_CHAR_BASE_OFFSET).add(targetOffset * Unsafe.ARRAY_CHAR_INDEX_SCALE); 67218065Sadrian int result = AMD64StringIndexOfNode.optimizedStringIndexPointer(sourcePointer, sourceCount - fromIndex, targetPointer, targetCount); 68218065Sadrian if (result >= 0) { 69218065Sadrian return result + totalOffset; 70218065Sadrian } 71218065Sadrian return result; 72218065Sadrian } 73218065Sadrian} 74218065Sadrian